AOA's Sul Hyun made another apology regarding the recent history quiz controversy that surfaced after the recent airing of 'Channel AOA.'

On May 16th, AOA's official comeback showcase was held at YES24 LIVE HALL, which is located in Gwangjang-dong, Seoul.Recently, Ji Min and Sul Hyun got into a controversy due to the lack of historical knowledge that they demonstrated on reality program 'Channel AOA.'Regarding the controversy, Sul Hyun said, "I will do my best to not make any similar mistakes again."Sul Hyun ended up showing tears while an apology once again.Meanwhile, AOA's new title track, 'GOOD LUCK,' is a pop dance number with powerful drum beats, bass beats, and catchy melodies.